Surface modification and coating technologies are widely used to augment product surface function and to improve performance. With advances in materials and processes, surface technology plays a crucial role in realising new engineering breakthroughs or performance enhancement in various fields. A number of different approaches have been used to fabricate nanocoatings including vapour deposition, chemical reduction, pulsed laser deposition, mechanical milling, and electrochemical deposition. Among these processes, the sol-gel process, being able to be carried out in solution, is viewed as one of the most attractive. The sol-gel method is a chemical way to deposit coatings on a substrate and can be used for a range of nanotechnological products, such as powders, ultra-thin coatings, aero gels and fibers.